Oil soluble sulphonates of active bases and the method of preparing the same



Patented Dec. 29, 1936 1 v s BASES AND THE METHOD OF PREPARING THE SAME Hyym E. Buc, Roselle, N. J assignor to Standard Oil Development Company, a corporation of Delaware No Drawing. Application September 4, 1929, Serial No. 390,434

6 Claims. (Cl. 26025) This invention relates to a process of making oil-insoluble physiologically active organic compounds soluble in oil. More specifically it relates to a process of preparing sulphonic acid derivatives of physiologically active organic compounds having a basic group. The invention also comprises the products produced by such process.

It is often desirable to make oil-insoluble medicinal compounds, insecticides, insect repellents with a solvent such as isopropyl alcohol and the separated alcohol extract is evaporated to remove the alcohol, leaving the sulphonic acids as a residue. When the term concentrated acid is used, it will be understood to include fuming acid.

The combination of the physiologically active organic compounds with the sulphonic acid may be brought about by contacting the compound 10 and other physiologically active organic comwith the sulphonic acid, or a salt thereof in an pounds soluble in oils, such as petroleum disacid medium. My preferred method of operatillates. I have discovered that such compounds tion, however consists in carrying out the reaccan be made soluble in oils, and compounds of tion in a diluted acid medium. The reaction will limited solubility can be made more easily solbe accelerated by agitation and moderate heat.

uble, by causing the same to combine with an oil- The reaction product is obtained as a precipisoluble sulphonic acid derived from petroleum. tate and may be further purified by methods The organic compounds which can be made to well known in organic chemistry. react in this manner must contain a basic group The following example will illustrate one metheither in combination with an acid or capable 0d of carrying out my invention.

of combining with an acid. An alkali metal salt such as the sodium salt The oil soluble sulphonic acids used in my of the oil-soluble sulphonic acid is added to an process are formed in the treatment of petroleum aqueous solution of nicotine together with sufoils with concentrated sulphuric acid, fuming ficient, amount of mineral acid Such as hydrosulPhuric acid 9 Sulphuric anhydride and chloric acid to liberate the sulphonic acid and main dissolved in the 0 11 after the treatment. keep t mixture i acid d ti may The 1udge filmed dunPg h treatmfimt also be verified by any of the known means such as contains certain sulphuric ac d derivatives but testing with litmus paper The mixture The mentioned oil-soluble sulphonic acids are sepphona'teprgclpltates out m of a gummy mass which is separated by filtration, washed and arated from the 011 by extraction with various t t t It solvents, such as isopropyl alcohol, and are used dned preferably at mmlera e either in the acid state or in the form of their may also be further Punfled by dlssolvmg in salts such as alkali metal salt for the purposes any the known Organ: SOIVeI ItS' The of my invention. It may be mentioned that the proxlma'te amounts of w mammals used are: fuming sulphuric acid treatment is one of the 1 p t by Weight of nicotine, 1 parts or less main process steps in the preparation of the soof Sodium sulphonate Obtained in the u a called white oils, such as the ones known nd ture of medicinal white oil. It will be understood the trade names Nujol, Marcel, et a d that the amount of sodium sulphonate will vary 40 therefore the manufacture of white oils provides w t the Oil base from Which the Oil-Soluble $111- an ample source of oil-soluble sulphoni 1 phonic acid is obtained. It is preferable to have The composition of these sulphonic acids is a slight deficiency o the p o a e, ot erwise very various according to the oil from which they the precipitate y not coagulate l originate and they have been given the general y an entirely Similar method I have P p formulae CnHn-12SO3 and CnH21z-10S03. Their su p ni a d p ds of t r pal alkamolecular weight is estimated to be between 400 loids of cinchona bark, i. e. of quinine, quinidlne, and 500. The preferred sulphonic acids are obcinchonine, cinchonidine. Another compound of tained by treating a petroleum distillate of an different chemical class, of which I have p A. P. I. gravity of about 20 to 30 and Saybolt pared the sulphonic acid derivative, is p-amino Viscosity of 100 to 250 seconds at 100 F. with phenol. fuming sulphuric acid f fr m 5 t 15% $0 It will be understood that the above example Concentrated sulphuric may also be used, though is given by way of illustration only and my procthe yield of sulphonic acid is less. The sour oil ess may be carried out in various modifications.

after the separation of the acid sludge is washed I do not, therefore, wish to limit my invention petroleum oil treated with concentrated sulphuric. acid.

3. Oil soluble nicotine salts of sulphonic acids, said acids being derived from petroleum oils.

4. Oil soluble cinchona bark alkaloid salts of 5 sulphonic acids, said acids being derived from petroleum oils.

5. Oil soluble petroleum sulphonic acid salts of quinine alkaloids.

6. Oil soluble petroleum sulphonic acid salts 10 of cinchona alkaloids.

. HYYM E. BUC. 

